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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 29573
Experience:  GM Grand Master Technician 2007. 14 years experience.
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I have a 03 trailblazer with codes u1301, u1026, u1152. The

Customer Question

I have a 03 trailblazer with codes u1301, u1026, u1152. The guages,radio,ac,doorlocks/windows stop working intermittently and happens more when hot
Submitted: 2 years ago.
Category: Chevy
Expert:  GM Tech (Cam) replied 2 years ago.

hi there, I am Cam. Can I get your first name? Can you also tell me what grounds you checked, specific by location if you can .

Customer: replied 2 years ago.
Hi, I'm Travis. I've checked the following grounds. In the engine compartment, driver side by battery, by fuse box, firewall behind fuse box, hood above fuse box. Passenger side engine compartment above coolant resoivore. On the driver side frame under the driver door by ecbm and back above the rear wheel. Inside the cab I checked the one under the stereo and hvac controls, had several small grounds to one bolt.
Customer: replied 2 years ago.
On these grounds I polished up the contacts and bolts with a 3m scotch bright disc. Used the same bolts in engine compartment and replaced bolts on frame
Expert:  GM Tech (Cam) replied 2 years ago.

I think we are going to find a bad or weak connection at the rear fuse block. Looking at the codes, I see only one shared point of contact for these codes, and thats connections in the rear fuse block. No grounds are shared, so power at that fuse block only. Check over the connections into the fuse block, even put some dielectric grease on them and see what that does.

Customer: replied 2 years ago.
Okay I've been fiddling with the rear fuse block checking connections and fuses. This would be about the seventh time. However I started the car and was pulling fuses as the symptoms where going haywire. I found that when I pull the 10a hvac 3 fuse (36) the symptoms stop and everything's seems to function expect for the ac of couse. Going to leave the fuse out and make sure the symptoms don't return during a test drive.
Expert:  GM Tech (Cam) replied 2 years ago.

Ok, sounds good. Let me know what you find.

Customer: replied 2 years ago.
K no more bells and whistles everything seems to be working except the a/c
Customer: replied 2 years ago.
Where do we head from here
Expert:  GM Tech (Cam) replied 2 years ago.
I wonder if your heater control head is failing then and causing the data line to shut down. Check the connections on that unit and see if any are bad. If not then consider replacing it.
Customer: replied 2 years ago.
Where is this located
Expert:  GM Tech (Cam) replied 2 years ago.
It's the actual control unit in the dash with the dials and such.